GB1350491A - Over and under excitation protection circuit for alternating current power systems - Google Patents

Over and under excitation protection circuit for alternating current power systems

Info

Publication number
GB1350491A
GB1350491A GB3831071A GB3831071A GB1350491A GB 1350491 A GB1350491 A GB 1350491A GB 3831071 A GB3831071 A GB 3831071A GB 3831071 A GB3831071 A GB 3831071A GB 1350491 A GB1350491 A GB 1350491A
Authority
GB
United Kingdom
Prior art keywords
circuit
voltage
sources
over
proportional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3831071A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1350491A publication Critical patent/GB1350491A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • H02H7/062—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors for parallel connected generators

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Transformers (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

1350491 Protective arrangements WESTING- HOUSE ELECTRIC CORP 16 Aug 1971 [14 Sept 1970] 38310/71 Heading H2K A circuit arrangement for protection against under or over excitation of a plurality of polyphase power sources connected in parallel, comprises a circuit 12 for developing for each of the sources a first direct voltage V1 proportional to the difference between the reactive current of each source and the mean reactive current of the parallel sources, a circuit 14 for deriving a second direct voltage V2 proportional to the rectified voltage of the sources, a circuit 16 for producing a sensing voltage V3 proportional to the sum of V1 and V2, and circuits 66, 68 for comparing the voltage V3 with a reference voltage, e.g. from a D.C. supply 22. The output signal from either of the circuits 66, 68 may energize a trip coil of a circuit-breaker 4 to isolate a given generator 1. The circuit 12 may comprise a transformer 31 connected across an "equalizer" loop 13, 15 and to a clipper demodulator circuit 36, and a transformer 35 connected across the phases other than that associated with the loop. The voltage V1 from this circuit is applied through a resistor 47 to a terminal 56 also connected through a resistor 59 to the common junction of rectifiers 50 ... 52 which derive the rectified voltage V2. The resulting voltage V3 at the terminal 56 is applied to a circuit 18 which has a voltage sensing portion, a delay circuit portion 65 and a voltage detector portion 66, similar to the circuit of Specification 1,157,733, the output from the circuit 18 indicating an over-excitation fault. The voltage V3 at the terminal 56 is also applied to the voltage detector 68 which provides a signal indicating an under-excitation fault.
GB3831071A 1970-09-14 1971-08-16 Over and under excitation protection circuit for alternating current power systems Expired GB1350491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7192570 US3683199A (en) 1970-09-14 1970-09-14 Over-{11 and underexcitation protection circuit for alternating current power systems

Publications (1)

Publication Number Publication Date
GB1350491A true GB1350491A (en) 1974-04-18

Family

ID=22104473

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3831071A Expired GB1350491A (en) 1970-09-14 1971-08-16 Over and under excitation protection circuit for alternating current power systems

Country Status (5)

Country Link
US (2) US3683199A (en)
JP (1) JPS549291B2 (en)
DE (1) DE2145288A1 (en)
FR (1) FR2107642A5 (en)
GB (1) GB1350491A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2358676C3 (en) * 1973-11-24 1982-07-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit arrangement for monitoring and switching off a generator controlled by a regulator
US4348629A (en) * 1980-05-22 1982-09-07 Motorola, Inc. Stator fault detector for automotive alternator battery charging systems
US4510399A (en) * 1982-10-07 1985-04-09 Westinghouse Electric Corp. Demodulator circuit for parallel AC power systems
US4728806A (en) * 1986-12-05 1988-03-01 Westinghouse Electric Corp. DC link variable speed constant frequency power source paralleling controls
US4731690A (en) * 1986-12-05 1988-03-15 Westinghouse Electrical Corp. Real load unbalance protection system for parallel variable speed constant frequency electrical power systems
US4800291A (en) * 1987-03-04 1989-01-24 Basler Electric Company Electronic circuit for control of a voltage regulator of an electrical generator
US4754161A (en) * 1987-07-31 1988-06-28 Westinghouse Electric Corp. Circuit and method for paralleling AC electrical power systems
US4766327A (en) * 1987-07-31 1988-08-23 Westinghouse Electric Corp. Circuit and method for synchronizing power sources in a parallel AC electrical power system
US4797570A (en) * 1987-07-31 1989-01-10 Westinghouse Electric Corp. Automatic paralleling of AC power sources
JP2619539B2 (en) * 1989-11-02 1997-06-11 株式会社日立製作所 Automotive generator
US5047890A (en) * 1990-03-12 1991-09-10 Westinghouse Electric Corp. Differential current protection circuits
US5770897A (en) * 1996-09-16 1998-06-23 Abb Power T&D Company Inc. Hybrid solid state switch
US8120206B2 (en) * 2008-09-10 2012-02-21 Hamilton Sundstrand Corporation Method of detecting a sustained parallel source condition
US10432120B2 (en) * 2012-04-15 2019-10-01 Hamilton Sundstrand Corporation Automatic fault isolation methodology
EP4371234A1 (en) 2021-07-15 2024-05-22 Dolphin Design Circuit for detecting timing violations in a digital circuit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE527334A (en) * 1953-03-16
US3038089A (en) * 1959-09-04 1962-06-05 Collins Radio Co Duo-transistor amplitude and frequency sensitive electronic switch
US3076902A (en) * 1961-03-30 1963-02-05 Hewlett Packard Co Pulse circuits using diffused junction semiconductor devices
US3198961A (en) * 1962-06-26 1965-08-03 North American Aviation Inc Quantizer producing digital-output whose polarity and repetition-rate are respectively determined by phase and amplitude by analog-in-put
FR1413938A (en) * 1964-07-31 1965-10-15 Comp Generale Electricite Improvements to frequency discriminators
US3369810A (en) * 1964-09-28 1968-02-20 American Mach & Foundry Foul detector
US3480868A (en) * 1967-02-13 1969-11-25 Hughes Aircraft Co Large error servo oscillation inhibitor
US3524997A (en) * 1967-09-08 1970-08-18 Gen Electric Monolithic integrated phase control circuits
US3539820A (en) * 1968-01-10 1970-11-10 Westinghouse Electric Corp Real load unbalance protection circuit for alternating current power sources connected for parallel operation

Also Published As

Publication number Publication date
DE2145288A1 (en) 1972-03-16
JPS475622A (en) 1972-03-24
JPS549291B2 (en) 1979-04-23
US3748493A (en) 1973-07-24
FR2107642A5 (en) 1972-05-05
US3683199A (en) 1972-08-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee